Very detailed notes on any topic covered in lectures and readings. Including many examples and images for further understanding.
Received grade 9.6. (average was 5.6)
Psychometrics Summary - Everything you need to know
Summary of Book Chapters for Course 2.5 Psychometrics: An introduction
2.5C Psychometrics: An Introduction- Summary class notes (FSWP2-052-A)
All for this textbook (20)
Written for
Erasmus Universiteit Rotterdam (EUR)
Psychologie
Psychometrics: An Introduction (FSWP2052A)
All documents for this subject (85)
1
review
By: ormosyeszter • 7 months ago
Seller
Follow
christinauhlenbruck
Reviews received
Content preview
Le c t u re ( H 1.2 +
3:
psychological testis a systematic
A
procedure for comparing the t wo or more ppl.
behavior of
·behavioral sample (all kinds of behaviorl
collected in systematic way Istandardized conditions)
·
purpose is to delectdifferences btw ppl+cumparing behavior
·
psychometrics is the science concerned with evaluating attributes ofpsych. Tests:
Tupe ofinformation
·
·Reliability
validity
·
Challengesto m e a s u re m e n t :
final resultm ay notbe entirely real
someppare un aware ofthe meaning or implication oftheir results
↳can give distorted results
, Learning goals:Studentcan turn reactions to items into item scores andtest
scores.
n a t u re ofwa r ;a bility:
2 KINDS OF
VARIABILITY:
.
interindividual differences differences between people
-
·
intraindividual differences:differences emerging in one person over timesunder diff. Circumstances
va r i a b i l i t y and distribution of s c o re s
variantedistance from the mean
size ofvariance depends on:
degree to which scores in the distribution differ
·
the metric ofthe in the distribution (cmvs. M) scale ofthe variable
·
scores
+
Factor to consider when interpreting variance:
number is always greater than 0 (no such thing as
negative variance!)
·
no simple small/large interpretation possible
·
context/comparison is needed to interprett h e size
·
mainly importantfor its effects or other values (e.g.:correlation, reliability)
variance always assumes we are dealing with a normal
distribution!
When you go up on variable x,
does variable Y also 90 up?
notdependenton the scale oft he
variables
Standardized!
1 bc ofstandardization
,va r ia n c e - c ova r i a n c e ma rix
+
used to display all relationships
between variables
COMPOSITE SCORES
score thati s made up ofother scores
·
·e.9.:my total score on a questionnaire thatmeasures ADHD is the sum ofmy response to the
questions. We KNOW tHAADHD has two components linattention and hyperactivity / impulsivity)
score:{"
= 4;
composite
·
3 1 4
+
=
variance -
covariance Matrix
1.291 0.400 2
+
+
= 0.400 2.491
=
covariance:0.400
variance, natt.:1.291;Hyperact: 400 I ADHD 2.491
=
calculating variance:
4 adding up all the variances ofall the items on a questionnaire,
also add twice the covariance ofthe items
, Interpreting test s c o re s :
transformation
-
converted standard scores:
4 converting scores with one scale to
Other Scores
1. calculate z-scores
4 I
z*
sDnertmearnew=
4 When dealing with normal
distribution!
calculating percentiles:
·Normal distribution:
iuse z-scores to calculate/10okup p-value
Otherwise:
use frequency table formula!
+
(Fx -
5fx)x100
Px
= .
N
0.5 *10
A
continuity
72% ofppi scored a 4
or lower
currection
a
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller christinauhlenbruck. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £11.68. You're not tied to anything after your purchase.